Coupling and entangling of quantum states in quantum dot molecules

Citation
M. Bayer et al., Coupling and entangling of quantum states in quantum dot molecules, SCIENCE, 291(5503), 2001, pp. 451-453
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Multidisciplinary,Multidisciplinary,Multidisciplinary
Journal title
SCIENCE
ISSN journal
0036-8075 → ACNP
Volume
291
Issue
5503
Year of publication
2001
Pages
451 - 453
Database
ISI
SICI code
0036-8075(20010119)291:5503<451:CAEOQS>2.0.ZU;2-R
Abstract
We demonstrate coupling and entangling of quantum states in a pair of verti cally aligned, self-assembled quantum dots by studying the emission of an i nteracting electron-hole pair (exciton) in a single dot molecule as a funct ion of the separation between the dots. An interaction-induced energy split ting of the exciton is observed that exceeds 30 millielectron volts for a d ot layer separation of 4 nanometers. The results are interpreted by mapping the tunneling of a particle in a double dot to the problem of a single spi n. The electron-hole complex is shown to be equivalent to entangled states of two interacting spins.